In the first aired episode, Fred and Ethel were celebrating their 18th wedding anniversary. The episode, “The Girls Want to Go to a Nightclub,” turns that occasion into a comic dispute over how the couples should celebrate.
Ethel wants to go to the Copacabana, while Fred prefers attending a boxing match. Lucy sides with Ethel and Ricky sides with Fred, so both couples begin scheming to get their way. The argument eventually leads Lucy and Ethel to pretend they have dates, prompting Fred and Ricky to arrange dates of their own. The resulting misunderstandings establish the series’ central pattern of domestic rivalry and elaborate deception.
The episode can confuse viewers because it was the first broadcast episode but the second one filmed. The unaired pilot was produced earlier and is usually excluded from the regular episode count. Another continuity wrinkle is that later episodes refer to different Mertz anniversaries, so the 18th anniversary belongs specifically to this premiere story rather than serving as a fixed chronology for every episode.